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Property, plant and equipment (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year € 70,793 € 68,005  
Additions 8,490 9,067  
Depreciation (7,199) (7,308)  
Net (impairments) reversals 207 86  
Disposals (1,448)    
Write-off 239 289 € 678
Currency translation differences (7,025) 1,886  
Reclassification to discontinued operations and assets held for sale   (11)  
Other changes (421) (643)  
Net book amount at the end of the year 63,158 70,793 68,005
Gross carrying amount [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 197,272    
Net book amount at the end of the year 183,777 197,272  
Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 126,479    
Net book amount at the end of the year 120,619 126,479  
Provisions for depreciation and impairments 120,619 126,479  
Land [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 448 510  
Additions 2 1  
Net (impairments) reversals (5) (64)  
Disposals (12)    
Currency translation differences (2) 1  
Reclassification to discontinued operations and assets held for sale   (8)  
Other changes 47 8  
Net book amount at the end of the year 478 448 510
Land [Member] | Gross carrying amount [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 537    
Net book amount at the end of the year 571 537  
Land [Member] | Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Provisions for depreciation and impairments 93 89  
Buildings [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 810 818  
Additions 20 22  
Depreciation (71) (66)  
Net (impairments) reversals (5) (3)  
Disposals (3)    
Currency translation differences (3) 1  
Reclassification to discontinued operations and assets held for sale   (2)  
Other changes 87 40  
Net book amount at the end of the year 835 810 818
Buildings [Member] | Gross carrying amount [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 3,416    
Net book amount at the end of the year 3,490 3,416  
Buildings [Member] | Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Provisions for depreciation and impairments 2,655 2,606  
Plant And Machinery [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 50,270 40,667  
Additions 153 204  
Depreciation (6,996) (7,087)  
Net (impairments) reversals 436 345  
Disposals 3    
Write-off (3) (198)  
Currency translation differences (5,272) 1,329  
Reclassification to discontinued operations and assets held for sale   (1)  
Other changes 10,571 15,011  
Net book amount at the end of the year 49,162 50,270 40,667
Plant And Machinery [Member] | Gross carrying amount [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 167,007    
Net book amount at the end of the year 160,751 167,007  
Plant And Machinery [Member] | Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Provisions for depreciation and impairments 111,589 116,737  
Industrial and commercial equipment [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 300 326  
Additions 27 32  
Depreciation (63) (66)  
Net (impairments) reversals (1) (1)  
Write-off (2) (2)  
Currency translation differences (8)    
Other changes (17) 11  
Net book amount at the end of the year 236 300 326
Industrial and commercial equipment [Member] | Gross carrying amount [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 1,415    
Net book amount at the end of the year 1,264 1,415  
Industrial and commercial equipment [Member] | Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Provisions for depreciation and impairments 1,028 1,115  
Other Property Plant And Equipment [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 309 403  
Additions 52 42  
Depreciation (69) (89)  
Net (impairments) reversals (5) (17)  
Disposals (6)    
Currency translation differences (18) 4  
Other changes (2) (34)  
Net book amount at the end of the year 261 309 403
Other Property Plant And Equipment [Member] | Gross carrying amount [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 2,160    
Net book amount at the end of the year 1,954 2,160  
Other Property Plant And Equipment [Member] | Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Provisions for depreciation and impairments 1,693 1,851  
Tangible assets in progress and advances [Member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 18,656 25,281  
Additions 8,236 8,766  
Net (impairments) reversals (213) (174)  
Disposals (1,430)    
Write-off (234) (89)  
Currency translation differences (1,722) 551  
Other changes (11,107) (15,679)  
Net book amount at the end of the year 12,186 18,656 € 25,281
Tangible assets in progress and advances [Member] | Gross carrying amount [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Book amount at the beginning of the year 22,737    
Net book amount at the end of the year 15,747 22,737  
Tangible assets in progress and advances [Member] | Accumulated impairment [member]      
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]      
Provisions for depreciation and impairments € 3,561 € 4,081